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   1 /*
   2  * arch/sh/boards/superh/microdev/irq.c
   3  *
   4  * Copyright (C) 2003 Sean McGoogan (Sean.McGoogan@superh.com)
   5  *
   6  * SuperH SH4-202 MicroDev board support.
   7  *
   8  * May be copied or modified under the terms of the GNU General Public
   9  * License.  See linux/COPYING for more information.
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/irq.h>
  14 #include <linux/interrupt.h>
  15 #include <asm/system.h>
  16 #include <asm/io.h>
  17 #include <mach/microdev.h>
  18
  19 #define NUM_EXTERNAL_IRQS 16    /* IRL0 .. IRL15 */
  20
  21 static const struct {
  22         unsigned char fpgaIrq;
  23         unsigned char mapped;
  24         const char *name;
  25 } fpgaIrqTable[NUM_EXTERNAL_IRQS] = {
  26         { 0,                            0,      "unused"   },           /* IRQ #0       IRL=15  0x200  */
  27         { MICRODEV_FPGA_IRQ_KEYBOARD,   1,      "keyboard" },           /* IRQ #1       IRL=14  0x220  */
  28         { MICRODEV_FPGA_IRQ_SERIAL1,    1,      "Serial #1"},           /* IRQ #2       IRL=13  0x240  */
  29         { MICRODEV_FPGA_IRQ_ETHERNET,   1,      "Ethernet" },           /* IRQ #3       IRL=12  0x260  */
  30         { MICRODEV_FPGA_IRQ_SERIAL2,    0,      "Serial #2"},           /* IRQ #4       IRL=11  0x280  */
  31         { 0,                            0,      "unused"   },           /* IRQ #5       IRL=10  0x2a0  */
  32         { 0,                            0,      "unused"   },           /* IRQ #6       IRL=9   0x2c0  */
  33         { MICRODEV_FPGA_IRQ_USB_HC,     1,      "USB"      },           /* IRQ #7       IRL=8   0x2e0  */
  34         { MICRODEV_IRQ_PCI_INTA,        1,      "PCI INTA" },           /* IRQ #8       IRL=7   0x300  */
  35         { MICRODEV_IRQ_PCI_INTB,        1,      "PCI INTB" },           /* IRQ #9       IRL=6   0x320  */
  36         { MICRODEV_IRQ_PCI_INTC,        1,      "PCI INTC" },           /* IRQ #10      IRL=5   0x340  */
  37         { MICRODEV_IRQ_PCI_INTD,        1,      "PCI INTD" },           /* IRQ #11      IRL=4   0x360  */
  38         { MICRODEV_FPGA_IRQ_MOUSE,      1,      "mouse"    },           /* IRQ #12      IRL=3   0x380  */
  39         { MICRODEV_FPGA_IRQ_IDE2,       1,      "IDE #2"   },           /* IRQ #13      IRL=2   0x3a0  */
  40         { MICRODEV_FPGA_IRQ_IDE1,       1,      "IDE #1"   },           /* IRQ #14      IRL=1   0x3c0  */
  41         { 0,                            0,      "unused"   },           /* IRQ #15      IRL=0   0x3e0  */
  42 };
  43
  44 #if (MICRODEV_LINUX_IRQ_KEYBOARD != 1)
  45 #  error Inconsistancy in defining the IRQ# for Keyboard!
  46 #endif
  47
  48 #if (MICRODEV_LINUX_IRQ_ETHERNET != 3)
  49 #  error Inconsistancy in defining the IRQ# for Ethernet!
  50 #endif
  51
  52 #if (MICRODEV_LINUX_IRQ_USB_HC != 7)
  53 #  error Inconsistancy in defining the IRQ# for USB!
  54 #endif
  55
  56 #if (MICRODEV_LINUX_IRQ_MOUSE != 12)
  57 #  error Inconsistancy in defining the IRQ# for PS/2 Mouse!
  58 #endif
  59
  60 #if (MICRODEV_LINUX_IRQ_IDE2 != 13)
  61 #  error Inconsistancy in defining the IRQ# for secondary IDE!
  62 #endif
  63
  64 #if (MICRODEV_LINUX_IRQ_IDE1 != 14)
  65 #  error Inconsistancy in defining the IRQ# for primary IDE!
  66 #endif
  67
  68 static void enable_microdev_irq(unsigned int irq);
  69 static void disable_microdev_irq(unsigned int irq);
  70
  71         /* shutdown is same as "disable" */
  72 #define shutdown_microdev_irq disable_microdev_irq
  73
  74 static void mask_and_ack_microdev(unsigned int);
  75 static void end_microdev_irq(unsigned int irq);
  76
  77 static unsigned int startup_microdev_irq(unsigned int irq)
  78 {
  79         enable_microdev_irq(irq);
  80         return 0;               /* never anything pending */
  81 }
  82
  83 static struct hw_interrupt_type microdev_irq_type = {
  84         .typename = "MicroDev-IRQ",
  85         .startup = startup_microdev_irq,
  86         .shutdown = shutdown_microdev_irq,
  87         .enable = enable_microdev_irq,
  88         .disable = disable_microdev_irq,
  89         .ack = mask_and_ack_microdev,
  90         .end = end_microdev_irq
  91 };
  92
  93 static void disable_microdev_irq(unsigned int irq)
  94 {
  95         unsigned int fpgaIrq;
  96
  97         if (irq >= NUM_EXTERNAL_IRQS)
  98                 return;
  99         if (!fpgaIrqTable[irq].mapped)
 100                 return;
 101
 102         fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
 103
 104         /* disable interrupts on the FPGA INTC register */
 105         ctrl_outl(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTDSB_REG);
 106 }
 107
 108 static void enable_microdev_irq(unsigned int irq)
 109 {
 110         unsigned long priorityReg, priorities, pri;
 111         unsigned int fpgaIrq;
 112
 113         if (unlikely(irq >= NUM_EXTERNAL_IRQS))
 114                 return;
 115         if (unlikely(!fpgaIrqTable[irq].mapped))
 116                 return;
 117
 118         pri = 15 - irq;
 119
 120         fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
 121         priorityReg = MICRODEV_FPGA_INTPRI_REG(fpgaIrq);
 122
 123         /* set priority for the interrupt */
 124         priorities = ctrl_inl(priorityReg);
 125         priorities &= ~MICRODEV_FPGA_INTPRI_MASK(fpgaIrq);
 126         priorities |= MICRODEV_FPGA_INTPRI_LEVEL(fpgaIrq, pri);
 127         ctrl_outl(priorities, priorityReg);
 128
 129         /* enable interrupts on the FPGA INTC register */
 130         ctrl_outl(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTENB_REG);
 131 }
 132
 133         /* This functions sets the desired irq handler to be a MicroDev type */
 134 static void __init make_microdev_irq(unsigned int irq)
 135 {
 136         disable_irq_nosync(irq);
 137         irq_desc[irq].chip = &microdev_irq_type;
 138         disable_microdev_irq(irq);
 139 }
 140
 141 static void mask_and_ack_microdev(unsigned int irq)
 142 {
 143         disable_microdev_irq(irq);
 144 }
 145
 146 static void end_microdev_irq(unsigned int irq)
 147 {
 148         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 149                 enable_microdev_irq(irq);
 150 }
 151
 152 extern void __init init_microdev_irq(void)
 153 {
 154         int i;
 155
 156                 /* disable interrupts on the FPGA INTC register */
 157         ctrl_outl(~0ul, MICRODEV_FPGA_INTDSB_REG);
 158
 159         for (i = 0; i < NUM_EXTERNAL_IRQS; i++)
 160                 make_microdev_irq(i);
 161 }
 162
 163 extern void microdev_print_fpga_intc_status(void)
 164 {
 165         volatile unsigned int * const intenb = (unsigned int*)MICRODEV_FPGA_INTENB_REG;
 166         volatile unsigned int * const intdsb = (unsigned int*)MICRODEV_FPGA_INTDSB_REG;
 167         volatile unsigned int * const intpria = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(0);
 168         volatile unsigned int * const intprib = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(8);
 169         volatile unsigned int * const intpric = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(16);
 170         volatile unsigned int * const intprid = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(24);
 171         volatile unsigned int * const intsrc = (unsigned int*)MICRODEV_FPGA_INTSRC_REG;
 172         volatile unsigned int * const intreq = (unsigned int*)MICRODEV_FPGA_INTREQ_REG;
 173
 174         printk("-------------------------- microdev_print_fpga_intc_status() ------------------\n");
 175         printk("FPGA_INTENB = 0x%08x\n", *intenb);
 176         printk("FPGA_INTDSB = 0x%08x\n", *intdsb);
 177         printk("FPGA_INTSRC = 0x%08x\n", *intsrc);
 178         printk("FPGA_INTREQ = 0x%08x\n", *intreq);
 179         printk("FPGA_INTPRI[3..0] = %08x:%08x:%08x:%08x\n", *intprid, *intpric, *intprib, *intpria);
 180         printk("-------------------------------------------------------------------------------\n");
 181 }
 182
 183